Method of producing electric insulating bodies.



UNITED STATES PATENT OFFICE.

HANS BIEHN, OF BUDAPEST, AUSTRIA-HUNGARY, ASSIGNORTO PYRISO- LITH ISOLATING MATERIAL MANUFACTURING COMPANY, LIMITED, OF BUDAPEST, AUSTRIA-HUN GARY.

METHOD OF PFIODUGING ELECTRIC INSULATING BODIES.

SPECIFICATION formingpart of Letters Patent No. 724,079, dated March 31, 1903.

Application filed April 29, 1902. Serial No. 105,200. (No specimens.)

To all whom it may concern.-

Be it known that I, HANS BIEHN, manufacturer, a subject of the Emperor of Austria Hungary, residing at Budapest, Austria-Hungary, have invented new and useful Improvements in Methods of Producing Electric Insulating Bodies, of which the following is a specification.

The present invention relates to a method for producing electric insulating bodies of brittle pulverized insulating material and a fusible bituminous substance, which bodies are adapted to be used for various purposes and are characterized by their superior insulating quality and capability of withstanding external influences.

The essential features of the method are as follows: The brittle material, which in itself is a good insulating agent, has to ofier proper resistance to external influences, for which purpose lime, gypsum, magnesite, porcelainclay, quartz, mica, glass, and the like are, for instance, used. The natural or artificial bituminous substance should be solid at ordinary temperature and commence to melt only at 37 to centigrade, those products known as bitumen pur or goudron being particularly suitable. One of the brittle insulating materials referred to above or a mixture of several such materials is finely pulverized and heated to a temperature of to 100 centigrade. For the purpose of maintaining the temperature the heating takes place in double-walled receptacles, preferably revoluble closed cylinders, which are heated by means of hot water, steam, or air passed between the double walls in a manner adapted to be easily regulated. On the powder being brought to the desired temperature the fusible bituminous substance or a mixture of such substances is added, preferably in proportions of eighty-nine to ninty-three parts of powder and eleven to seven parts of bitumen, all taken by weight, the mass at the same time being stirred and the temperature maintained. When the mass has been thoroughly mixed, a dry and loose powder is formed, even at the aforesaid temperature, said powder containing very few lumps, which, however, can be easily ground to powder. The

powder-like material thus obtained can be di* rectly used in the manufacture of insulating is preferable that the objects removed from the molds should be allowed to cool slowly. For producing the mass natural bituminous substances may also be used, which contain the necessary ingredients and in which, the

proportions can be suitably changed, .if necessary, by a corresponding addition of lime or the like or bitumen. v stances are finely ground and further treated according to the method described above that is to say, heated to a temperature of 140 to 1809 centigrade and compressed in molds. In order to increase the solidity, the mass can be vulcanized in the known manner, aftor the mixing of the ingredients has taken place, by means of an addition of sulfur up to one per cent.

According to the method described above any insulating bodies--for instance, cup-insulators, insulating-tubes, supports forincandescent-lamp holders, cable-boxes, or the likecan be made which were hitherto made of porcelain, micanite, ambroin, enameled iron, or the like. Larger objects may be suitably painted, as described.

What I claim as my invention, and desire to secure by Letters Patent, is-

1.. A method for producing electric insulate ing bodies of pulverized brittle insulating material and a fusible bituminous substance said pulverized brittle insulating material being heated to a temperature of 70 to 100 centigrade, whereupon while maintaining the said temperature and continually stirring the mass the bituminous substane is added and the whole, after complete mixing, heated to The bitnminoussuba temperature of 140 to 180 centigrade and compressed to about half its volume in suitable molds, substantially as specified.

2. A method for producing electric insulating bodies of pulverized lime and bitumen pur, said pulverized lime being heated to a temperature of to centigrade, Whereupon while maintaining the said temperature and continually stirring the mass the bitumen pur is added and the whole, after complete mixing, heated to a temperature of to centigrade and compressed to about half its volume in suitable molds, sustantially as specified.

3. A method for producing electric insulating bodies of pulverized brittle insulating material and a fusible bituminous substance, eleven to seven parts by weight of said pulver ized brittle insulating material being heated to a temperature of 70 to 100 centigrade, whereupon while maintaining the said temperature and continually stirring the mass eighty-nine to ninety-three parts by weight of bituminous substance are added and the whole, aftercomplete mixing, heated to a temperature of 140 to 180 centigrade and conipressed to about half its volume in suitable molds, substantially as specified.

4. A method for producing electric insulating bodies of pulverized brittle insulating material and a fusible bituminous substance said pulverized brittle insulating material being heated to a temperature of 70 to 100 centigrade, whereupon while maintaining the said temperature and continually stirring the mass the bituminous substance is added and the whole after complete mixing is left to cool and the lumps that may be contained therein ground to powder, said mass being then heated to a temperature of 140 to 180 centigrade and compressed to about half its volume in suitable molds, substantially as and for the purpose specified.

In witness whereof I have hereunto set my hand in presence of two witnesses.

HANS BIEHN.

WVitnesses:

MICHAEL Rowii, EUGEN HARSANY. 

